Answer :
Answer:
Average power will be equal to 6.66 watt
Explanation:
We have given radius R = 0.5 m
Mass of disk m = 400 kg
Angular velocity [tex]\omega =2rad/sec[/tex]
Time is given t = 15 seconds
Moment of inertia of disk [tex]I=\frac{1}{2}mR^2[/tex]
[tex]I=\frac{1}{2}\times 400\times 0.5^2=50kgm^2[/tex]
Rotational energy is equal to [tex]KE_{rotational}=\frac{1}{2}I\omega ^2[/tex]
[tex]KE_{rotational}=\frac{1}{2}\times 50\times 2^2=100J[/tex]
Average power is equal to [tex]P=\frac{energy}{time}[/tex]
[tex]P=\frac{100}{15}=6.66watt[/tex]
Average power will be equal to 6.66 watt